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  • Title: Loss measurement of plasmonic modes in planar metal-insulator-metal waveguides by an attenuated total reflection method.
    Author: Lin CI, Gaylord TK.
    Journal: Opt Lett; 2010 Nov 15; 35(22):3814-6. PubMed ID: 21082006.
    Abstract:
    We report experimental excitation and characterization of surface plasmon modes in planar metal-insulator-metal (MIM) waveguides. Our approach is based on determining the width of the reflection angular spectrum in the attenuated total reflection (ATR) configuration. Owing to its transverse character, the ATR configuration provides a more straightforward and simpler way to determine the loss of plasmonic modes in MIM structures, compared to using tapered end couplers with multiple waveguide samples or scanning near-field optical microscopy. In this Letter, two waveguide structures with Au claddings and 50/200 nm SiO(2) cores are investigated. The propagation lengths measured at λ = 1.55 μm are 5.7 and 18 μm, respectively, in agreement with the theoretical predictions.
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